package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_KEY;

public class RefreshIntercepter implements HandlerInterceptor {

    private StringRedisTemplate stringRedisTemplate;
    //通过构造函数注入，在拦截器MVCConfig中创建对象
    public RefreshIntercepter(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
// 1.获取请求头中的token
        String token = request.getHeader("authorization");
        if(StrUtil.isBlank(  token)){
           return true;
        }
        // 2.基于token获取redis中的用户
        Map<Object, Object> entries = stringRedisTemplate.opsForHash().entries(LOGIN_USER_KEY + token);
        // 3.判断用户是否存在
        if (entries.isEmpty()) {
            // 4.不存在，拦截
            return true;
        }
        // 5.将存储的Map转为UserDTO
        UserDTO userDTO = new UserDTO();
        BeanUtil.fillBeanWithMap(entries,userDTO, false);//将map填充userDTO
        //6.存在，保存用户到ThreadLocal
        UserHolder.saveUser(userDTO);
        // 7.刷新token有效期
        stringRedisTemplate.expire(LOGIN_USER_KEY + token, RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        // 8.放行
        return true;
    }



    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
// 1.移除用户
        UserHolder.removeUser();
    }
}
